// Copyright 2019 Google, LLC.  All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: prod-OptionalExpression
description: >
  optional chain in init/test/update of for statement
info: |
  IterationStatement
    for (Expression; Expression; Expression) Statement
features: [optional-chaining]
---*/

// OptionalExpression in test.
function Test() {
    let count;
    const obj = {a: true};
    for (count = 0; obj?.a; count++) {
      if (count > 0) break;
    }
    assert.sameValue(count, 1);

// OptionalExpression in init/test/update.
    let count2 = 0;
    const obj2 = undefined;

    for (obj?.a; obj2?.a; obj?.a) { count2++; }
    assert.sameValue(count2, 0);

    for (obj?.a; undefined?.a; obj?.a) { count2++; }
    assert.sameValue(count2, 0);

// Short-circuiting
    let touched = 0;
    const obj3 = {
      get a() {
        count++;
        return undefined; // explicit for clarity
      }
    };
    for (count = 0; true; obj3?.a?.[touched++]) {
      if (count > 0) { break; }
    }
    assert.sameValue(count, 1);
    assert.sameValue(touched, 0);
}

// preheat
const NUMBER_OF_PREHEAT = 1;
for (let i = 0; i < NUMBER_OF_PREHEAT; i++) {
    Test();
}

ArkTools.jitCompileAsync(Test);
assert.sameValue(ArkTools.waitJitCompileFinish(Test), true, '[JIT] JIT disabled.');

// test
const NUMBER_OF_TEST = 1; // or 2
for (let i = 0; i < NUMBER_OF_PREHEAT; i++) {
    Test();
}
